Objective of this research was to analyze the stress of a 48 kg LPG cylinder designed under Thai Industrial Standard TIS 27-254. The design was employed by using test pressure of 3.3 MPa and the tank wall thickness of 2.65 mm which provided the maximum tensile strength of 429.3 MPa, yield strength of 286.2 MPa and burst pressure of 5.99 MPa. The material used to produce the gas cylinder was SG295 grade steel with a yield strength of 300 MPa and a maximum tensile strength of 440 MPa, which covered the design requirements. The research results were found that at the 85 percent of cylinder volume, gas density of 0.54 kg / l, liquid height of 0.9367 m and gauge pressure of 0.073 psi gave circumferential and longitudinal stresses of 0.0357 MPa and 0.0178 MPa, respectively. According to analysis results of finite element method revealed that the stress concentration area was the circumference at the center position of the tank with the highest value at the welding joint.
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